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Questions tagged [hobbyist]

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1 answer
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Why am I not getting an output from this breadboarded phaser?

After following along with a hobbyist's video, I breadboarded a phaser. Unfortunately it seems my circuit is not achieving anything close to what the hobbyist achieved with his. I believe the issue is ...
Thxforhelping's user avatar
0 votes
0 answers
110 views

Confusion why MAX98357 won't get full power when shared with ESP32

I have what I thought was an easy circuit, but it is not behaving as I expected. I have an ESP32 devkit1 and a MAX98357 breakout board that I am trying to run together. The MAX98357 breakout is ...
Ian Reinhart Geiser's user avatar
0 votes
1 answer
203 views

Slow Start on 12V DC Motor

I am designing a small mechanical device that makes use of a 12VDC motor. I am trying to stick with components that can be easily sourced from Amazon or other hobby electronics stores so that others ...
Joshua Dotson's user avatar
0 votes
2 answers
406 views

Create TTL pulse with button press

Is there any way to get a 5V TTL signal (pulse of whatever duration, could even be a boxcar) from a button press with a very simple circuit or with some consumer device? I need this to do some ...
TheChymera's user avatar
0 votes
1 answer
71 views

I need help to assess what battery pack is needed for a project with both 3V and 5V power needs

I'm building an MP3 player into a photo frame for an art project. The frame is being mounted with three LEDs. When power is turned on, it will play an mp3 track too. I'm waiting for the kit to arrive ...
Davie Martin's user avatar
1 vote
1 answer
97 views

What's the best solution for creating a magnetic field around a small cylinder?

I'm a beginning electronics hobbyist so forgive the naive question. I'd like to have a small cylinder (1cm radius, 3-4cm length) where I could control a magnetic field around the cylinder with voltage....
Lucian Thorr's user avatar
1 vote
0 answers
270 views

Want to add a timer circuit to shut down battery powered toy

Would like to have: Operates down to 3V, Open drain/collector output, Programmable with resistor/capacitor/other, Integrated clock divider would be nice. Was thinking of using a 555 chip to shut off ...
Jean's user avatar
  • 161
0 votes
2 answers
70 views

Determining the optimum resistance in an LED light?

I'm reassembling an old rechargable torch which originally used a 4.2V lead acid battery. I changed it to a 3.7 li-ion battery and it's working just fine. The lighting plate contains 9 LEDs (connected ...
blackSmith's user avatar
0 votes
1 answer
149 views

Why would a laptop power off due to Raspberry Pico + servo?

For learning purposes I used Raspberry Pico to control a servo motor (using PWM.) I used an SG-5010 servo. I powered the servo from the Raspberry Pico (which was itself USB-attached to my laptop), GND(...
bohdan_trotsenko's user avatar
2 votes
0 answers
301 views

Sziklai pair style amplifier design

I am a beginner. I have built this schematic in LTspice. It's a five transistor amplifier with 2 voltage gain stages, 1 input stage, 1 output stage and 1 pair of Sziklai pair transistors. On testing ...
user avatar
0 votes
1 answer
2k views

What does the "A331" mean on a 2N2222 transistor?

I'm a hobbyist and as such I have an assorted collection of transistors. Most of them, if not all, have a cabalistic string after their names. Case in point is the 2N2222, which displays a "A331&...
Fausto Arinos Barbuto's user avatar
1 vote
2 answers
169 views

Can I use a 700V transistor with a 12V collector and base?

Please forgive any misunderstandings, as I am not an expert on electrical components. I am trying to build the following circuit: I need to be able to run 1.5A through the transistor. Can I use a ...
Ant's user avatar
  • 11
0 votes
2 answers
143 views

Doing digital IoT and some analog circuits without an oscilloscope

In my free time, I do electronic stuff as a hobby (at least for now.) I don't own an oscilloscope or a fancy multimeter due to the terrible financial state of my country. I am in Iran. In some ...
Hamidreza Kalantari's user avatar
1 vote
0 answers
73 views

Advice on first PCB - doppler sonar project

I have designed a schematic for a PCB for a doppler sonar project. The plan is to use a RPi 3B+ for some basic signal processing, an arduino to produce a 40 kHz wave via PWM which is filtered to ...
Ian Edwards's user avatar
2 votes
2 answers
278 views

Using an SN74HC595 as a single-wire state machine

I have an SN74HC595 shift register, and I want to use it to replace a microcontroller to save space and cost, since a microcontroller isn't really needed in my application. The application is a system ...
TeD van Loon's user avatar
0 votes
2 answers
85 views

Looking for 5mm discrete multi color LED [closed]

I want to make an electronic version of the Master Mind game as a hobby project. The challenge at the moment is to find right type of LEDs for the job. Below you ...
DEKKER's user avatar
  • 775
-1 votes
3 answers
161 views

Do 1MHz 3.3V through-hole oscillators exist?

I'm beginning my first MCU project and I'm having trouble finding a suitable oscillator. I want to run an ATtiny261 at very low power. It will be lighting up different combinations of LEDs based on ...
dvogel's user avatar
  • 121
0 votes
2 answers
150 views

Measure if bottle level is empty

Consider an upside bottle with liquid (water) oozing out from pinhole on head. I need to detect if water falls below a certain level. I searched and saw there are multiple sensors already available ...
Reddi Suresh's user avatar
15 votes
6 answers
1k views

Can I get help troubleshooting a simple hobby electronics circuit? Multimeter not measuring current drawn

I am following the experiment in the popular electronics book - "Make: Electronics third edition". However, when replicating one of the experiments mentioned in the book (specifically ...
Archit K's user avatar
  • 151
0 votes
1 answer
64 views

TXS0108E as bus isolator?

I've been looking for a Bi-directional IO isolator to "unplug" a microcontroller during startup, and found the TXS0108E. My question would be: can you tie VCCA = VCCB = 3.3v? according to ...
Germán's user avatar
0 votes
1 answer
55 views

Improve conceptual intervalometer for rotating potted plants

I'm trying to avoid having my plants tilting or otherwise looking bad after only getting sunlight from one direction. To solve it, I want to make the pots rotate. I'm trying to design a cheap, stand ...
Alexander Ohm's user avatar
0 votes
1 answer
77 views

Average lifespan of typical project box LEDs widely available for purchase [closed]

I tried searching for this but I just get light fixture LED information. I'm trying to determine the expected lifespan of a typical small LED like you'll find in electronics kits or hobbyist stores. I ...
VanGogh66's user avatar
  • 301
3 votes
2 answers
869 views

555 and loudspeaker - Beginner question

First of a disclaimer - I'm a hobbyist and quite the beginner at that, so bear with me. What I'm trying to build is a metronome with an astable 555 oscillator that is driving an 8 Ohm loudspeaker. I ...
Marius's user avatar
  • 39
0 votes
1 answer
164 views

Flywheel/Dynamo behavior under variable load

I have a special effects project in mind where I simulate a bellows and coal fire without, you know, actual fire. My vision thusfar involves rigging a flywheel to a short-stroke lever (the upper arm ...
William Walker III's user avatar
0 votes
3 answers
927 views

How to delay astable 555 timer IC by ~1 min

My problem: I've reproduced the 555 timer circuit from here: https://www.gadgetronicx.com/door-open-alarm-ic-555/. Because of the specifics of my application I'd like the signal at the speaker to be ...
Marius's user avatar
  • 39
18 votes
4 answers
6k views

How do you store ICs used in hobby electronics?

I've recently started working on a project and I need to find a way to store some ICs that I'm using. I have around five different ICs and someone said I could just put them all together in a small ...
Asitha Navaratne's user avatar
0 votes
2 answers
122 views

How can I use a 5200 mAh Li-Po battery to power multiple things?

I'm building an autonomous car and have a 7.4V 5200mAh 2S Li-Po battery that needs to power the following components: Brushless DC Motor (Through ESC) Raspberry Pi 4 Servo motor Arduino Uno Another ...
robotwaale's user avatar
1 vote
1 answer
1k views

Is this gate driver circuit sufficient to drive a parallel FET spot welder?

I am building a spot welder for attaching nickel strips to Li-Ion cells to make custom battery packs. There are plenty on the market but I wanted to use up some components and learn something. The ...
Joel Clark's user avatar
3 votes
3 answers
12k views

Can a short circuit kill the USB port of a PC?

I use a cut USB cable as a 5V power supply from my laptop. If the two wires on the other side happen to touch each other, will it kill my USB port? Just to be cautious.
Tubrag's user avatar
  • 189
2 votes
2 answers
1k views

Live plant as a touch switch

I’m a Jack of all trades sort of guy but have basically zero electrical knowledge. That being said, I want to use a live, real plant to turn on and off a light. I tried a touch switch replacement but ...
Man Eating Food's user avatar
0 votes
1 answer
1k views

Charging 18650 battery with built-in PCb

How would I charge an 18650 battery with a built-in protection circuit? This is for an infrared camera. I normally could charging the device via micro usb but port broke. 4 wires are soldered to the ...
wigoe1984's user avatar
7 votes
6 answers
2k views

When did DC-DC buck converter modules become so popular?

Is it just me or from maybe since 4 years ago every project online for hobbyist electronics is using switch-mode power circuits in them? Looking back 15 years ago at projects from when I started doing ...
dsalazar's user avatar
3 votes
1 answer
958 views

Which IC component is this?

I seem to have burned out this chip on my Hobby King ESC (see picture). I am not able to read the component part number. The ESC is no longer available to buy. What is the part number (so that I may ...
Shreyas P's user avatar
4 votes
4 answers
2k views

What's the difference between chip families

I've been trying to follow Ben Eater's 8 bit computer design (https://eater.net/8bit) and I've manged to build something that broadly works but it's not very reliable. Sometimes modules don't work, if ...
Stormcloud's user avatar
1 vote
0 answers
147 views

Micro-USB B - female weird pinout

fixing up a kids toy today that used a USB Micro-B cable/port. The female port was smashed up. I have started to remove the old female socket and noticed it did not use a standard pin out. Rather than ...
lje's user avatar
  • 11
0 votes
1 answer
517 views

Specifications of a motor which will light an led (momentarily) from hand-spinning?

EDIT: I feel I might have placed the emphasis wrongly in my original question so I'll try to revise it here. In the video cited the demonstrator can be seen spinning a small "hobby" motor ...
glaucon's user avatar
  • 123
0 votes
3 answers
218 views

Why are the parts more expensive than a Pro Micro? [closed]

I have just started studying electronics and I am having a good time. In the past my experience would have been to use cheap boards, such as the Pro Micro. What I find confusing is that parts, such as ...
securityauditor's user avatar
0 votes
1 answer
74 views

How does a layman interface with a system on a chip?

I'm looking to build an incredibly simple robot that I control via bluetooth. I've identified the CC2540 from TI which will theoretically allow me to do this. It sounds perfect, it's like 5 bucks. ...
Truman Purnell's user avatar
2 votes
2 answers
4k views

How to mount a PCB in a project box

Hi nearly finished my first electronics project and I need to think about how to mount it into a box. I feel like I am missing something absolutely obvious with how to use PCB spacers. Here is a ...
Remotec's user avatar
  • 121
0 votes
1 answer
42 views

Honeywell TH1100DH1004 - temperature signal

Is it possible to have this (non programmable ) thermostat communicate only a constant temperature reading regardless of what the sensor senses? My understanding is that it communicates a value set ...
Melvin's user avatar
  • 137
1 vote
4 answers
2k views

Safety: Can I harm myself using an AC, 9V 500mA power supply for experiments?

I'm about to embark on my first electronics project and would like to check off a safety question: I want to build a bicycle hub dynamo -> USB charger based on these instructions. It is basically a ...
Mark's user avatar
  • 13
0 votes
2 answers
656 views

Why is this circuit causing my breaker to trip?

I'm an electronics hobbyist and I decided to make my own electric heater/kiln thingy. It works fine for a couple of minutes, but then the breaker trips. This is my first project involving AC, so I'm a ...
Buretto's user avatar
  • 105
0 votes
4 answers
819 views

Adjustable Power Supply with LM317

I want to create an adjustable power supply for my electronics projects, and the cheapest/fastest option seems to be using an LM317. However, I do not want to blow things up by doing something wrong (...
taarak's user avatar
  • 13
1 vote
4 answers
140 views

What to look for when buying a reliable hobbyist soldering iron

I wanted to buy a soldering iron for some hobby tinkering, ordered one long ago from Wish! For a few quid, but as you must imagine it's awful. Doesn't heat uniformly, overheats and melts plastic. Tips ...
Bartek Malysz's user avatar
0 votes
2 answers
321 views

Phone on a breadbord

My current electronics project is to build a very simple customizable "phone". It is my own idea, with as ultimate goal to learn about microcontrollers and basic electronics. This is my set-up so far ...
Ibrahim's user avatar
  • 59
2 votes
0 answers
235 views

Hobby Project - Signal Frequency detector

Context: I have taken on a little side hobby project to learn by making a circuit which should be able to only go high when it sense an acoustic signal with a frequency around 40kHz. To do this I will ...
John Skolm's user avatar
2 votes
2 answers
3k views

Bandpass Filter: Single supply op amp design

I have taken on a hobby project and I am trying to make a circuit which would be able to identify an acoustic signal with a frequency of 40kHz. Here is the circuit of a band pass filter for this: ...
John sodart's user avatar
0 votes
1 answer
674 views

Should I spread the pads out on the footprint of a THT LED?

I have a 4 pin RGB LED with a common anode. I'm trying to make my first PCB and I am creating the footprint for the LED now. I don't have a datasheet for the LEDs unfortunately. I have a ruler ...
D. Patrick's user avatar
1 vote
2 answers
2k views

Do I need decoupling capacitors when I'm PWMing an LED?

I'm a hobbyist (well, less than a hobbyist really) trying to layout my first PCB design. I'm somewhat familiar with the concept of decoupling capacitors. I'm fading 3 LEDs in and out (really, it's ...
D. Patrick's user avatar
0 votes
1 answer
61 views

using 7.62mm screw terminals on prototype board

What have people done to be able to use 7.62mm screw terminals on prototype boards? I am trying to prototype something use screw terminals that have 7.62mm posts, but the prototype boards do not have ...
dorgan's user avatar
  • 3